// SPDX-License-Identifier: GPL-2.0+ /* * Intel PXA25x and IXP4xx on-chip full speed USB device controllers * * Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker) * Copyright (C) 2003 Robert Schwebel, Pengutronix * Copyright (C) 2003 Benedikt Spranger, Pengutronix * Copyright (C) 2003 David Brownell * Copyright (C) 2003 Joshua Wise */ /* #define VERBOSE_DEBUG */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_ARCH_LUBBOCK #include #endif #define UDCCR 0x0000 /* UDC Control Register */ #define UDC_RES1 0x0004 /* UDC Undocumented - Reserved1 */ #define UDC_RES2 0x0008 /* UDC Undocumented - Reserved2 */ #define UDC_RES3 0x000C /* UDC Undocumented - Reserved3 */ #define UDCCS0 0x0010 /* UDC Endpoint 0 Control/Status Register */ #define UDCCS1 0x0014 /* UDC Endpoint 1 (IN) Control/Status Register */ #define UDCCS2 0x0018 /* UDC Endpoint 2 (OUT) Control/Status Register */ #define UDCCS3 0x001C /* UDC Endpoint 3 (IN) Control/Status Register */ #define UDCCS4 0x0020 /* UDC Endpoint 4 (OUT) Control/Status Register */ #define UDCCS5 0x0024 /* UDC Endpoint 5 (Interrupt) Control/Status Register */ #define UDCCS6 0x0028 /* UDC Endpoint 6 (IN) Control/Status Register */ #define UDCCS7 0x002C /* UDC Endpoint 7 (OUT) Control/Status Register */ #define UDCCS8 0x0030 /* UDC Endpoint 8 (IN) Control/Status Register */ #define UDCCS9 0x0034 /* UDC Endpoint 9 (OUT) Control/Status Register */ #define UDCCS10 0x0038 /* UDC Endpoint 10 (Interrupt) Control/Status Register */ #define UDCCS11 0x003C /* UDC Endpoint 11 (IN) Control/Status Register */ #define UDCCS12 0x0040 /* UDC Endpoint 12 (OUT) Control/Status Register */ #define UDCCS13 0x0044 /* UDC Endpoint 13 (IN) Control/Status Register */ #define UDCCS14 0x0048 /* UDC Endpoint 14 (OUT) Control/Status Register */ #define UDCCS15 0x004C /* UDC Endpoint 15 (Interrupt) Control/Status Register */ #define UFNRH 0x0060 /* UDC Frame Number Register High */ #define UFNRL 0x0064 /* UDC Frame Number Register Low */ #define UBCR2 0x0068 /* UDC Byte Count Reg 2 */ #define UBCR4 0x006c /* UDC Byte Count Reg 4 */ #define UBCR7 0x0070 /* UDC Byte Count Reg 7 */ #define UBCR9 0x0074 /* UDC Byte Count Reg 9 */ #define UBCR12 0x0078 /* UDC Byte Count Reg 12 */ #define UBCR14 0x007c /* UDC Byte Count Reg 14 */ #define UDDR0 0x0080 /* UDC Endpoint 0 Data Register */ #define UDDR1 0x0100 /* UDC Endpoint 1 Data Register */ #define UDDR2 0x0180 /* UDC Endpoint 2 Data Register */ #define UDDR3 0x0200 /* UDC Endpoint 3 Data Register */ #define UDDR4 0x0400 /* UDC Endpoint 4 Data Register */ #define UDDR5 0x00A0 /* UDC Endpoint 5 Data Register */ #define UDDR6 0x0600 /* UDC Endpoint 6 Data Register */ #define UDDR7 0x0680 /* UDC Endpoint 7 Data Register */ #define UDDR8 0x0700 /* UDC Endpoint 8 Data Register */ #define UDDR9 0x0900 /* UDC Endpoint 9 Data Register */ #define UDDR10 0x00C0 /* UDC Endpoint 10 Data Register */ #define UDDR11 0x0B00 /* UDC Endpoint 11 Data Register */ #define UDDR12 0x0B80 /* UDC Endpoint 12 Data Register */ #define UDDR13 0x0C00 /* UDC Endpoint 13 Data Register */ #define UDDR14 0x0E00 /* UDC Endpoint 14 Data Register */ #define UDDR15 0x00E0 /* UDC Endpoint 15 Data Register */ #define UICR0 0x0050 /* UDC Interrupt Control Register 0 */ #define UICR1 0x0054 /* UDC Interrupt Control Register 1 */ #define USIR0 0x0058 /* UDC Status Interrupt Register 0 */ #define USIR1 0x005C /* UDC Status Interrupt Register 1 */ #define UDCCR_UDE (1 << 0) /* UDC enable */ #define UDCCR_UDA (1 << 1) /* UDC active */ #define UDCCR_RSM (1 << 2) /* Device resume */ #define UDCCR_RESIR (1 << 3) /* Resume interrupt request */ #define UDCCR_SUSIR (1 << 4) /* Suspend interrupt request */ #define UDCCR_SRM (1 << 5) /* Suspend/resume interrupt mask */ #define UDCCR_RSTIR (1 << 6) /* Reset interrupt request */ #define UDCCR_REM (1 << 7) /* Reset interrupt mask */ #define UDCCS0_OPR (1 << 0) /* OUT packet ready */ #define UDCCS0_IPR (1 << 1) /* IN packet ready */ #define UDCCS0_FTF (1 << 2) /* Flush Tx FIFO */ #define UDCCS0_DRWF (1 << 3) /* Device remote wakeup feature */ #define UDCCS0_SST (1 << 4) /* Sent stall */ #define UDCCS0_FST (1 << 5) /* Force stall */ #define UDCCS0_RNE (1 << 6) /* Receive FIFO no empty */ #define UDCCS0_SA (1 << 7) /* Setup active */ #define UDCCS_BI_TFS (1 << 0) /* Transmit FIFO service */ #define UDCCS_BI_TPC (1 << 1) /* Transmit packet complete */ #define UDCCS_BI_FTF (1 << 2) /* Flush Tx FIFO */ #define UDCCS_BI_TUR (1 << 3) /* Transmit FIFO underrun */ #define UDCCS_BI_SST (1 << 4) /* Sent stall */ #define UDCCS_BI_FST (1 << 5) /* Force stall */ #define UDCCS_BI_TSP (1 << 7) /* Transmit short packet */ #define UDCCS_BO_RFS (1 << 0) /* Receive FIFO service */ #define UDCCS_BO_RPC (1 << 1) /* Receive packet complete */ #define UDCCS_BO_DME (1 << 3) /* DMA enable */ #define UDCCS_BO_SST (1 << 4) /* Sent stall */ #define UDCCS_BO_FST (1 << 5) /* Force stall */ #define UDCCS_BO_RNE (1 << 6) /* Receive FIFO not empty */ #define UDCCS_BO_RSP (1 << 7) /* Receive short packet */ #define UDCCS_II_TFS (1 << 0) /* Transmit FIFO service */ #define UDCCS_II_TPC (1 << 1) /* Transmit packet complete */ #define UDCCS_II_FTF (1 << 2) /* Flush Tx FIFO */ #define UDCCS_II_TUR (1 << 3) /* Transmit FIFO underrun */ #define UDCCS_II_TSP (1 << 7) /* Transmit short packet */ #define UDCCS_IO_RFS (1 << 0) /* Receive FIFO service */ #define UDCCS_IO_RPC (1 << 1) /* Receive packet complete */ #ifdef CONFIG_ARCH_IXP4XX /* FIXME: is this right?, datasheed says '2' */ #define UDCCS_IO_ROF (1 << 3) /* Receive overflow */ #endif #ifdef CONFIG_ARCH_PXA #define UDCCS_IO_ROF (1 << 2) /* Receive overflow */ #endif #define UDCCS_IO_DME (1 << 3) /* DMA enable */ #define UDCCS_IO_RNE (1 << 6) /* Receive FIFO not empty */ #define UDCCS_IO_RSP (1 << 7) /* Receive short packet */ #define UDCCS_INT_TFS (1 << 0) /* Transmit FIFO service */ #define UDCCS_INT_TPC (1 << 1) /* Transmit packet complete */ #define UDCCS_INT_FTF (1 << 2) /* Flush Tx FIFO */ #define UDCCS_INT_TUR (1 << 3) /* Transmit FIFO underrun */ #define UDCCS_INT_SST (1 << 4) /* Sent stall */ #define UDCCS_INT_FST (1 << 5) /* Force stall */ #define UDCCS_INT_TSP (1 << 7) /* Transmit short packet */ #define UICR0_IM0 (1 << 0) /* Interrupt mask ep 0 */ #define UICR0_IM1 (1 << 1) /* Interrupt mask ep 1 */ #define UICR0_IM2 (1 << 2) /* Interrupt mask ep 2 */ #define UICR0_IM3 (1 << 3) /* Interrupt mask ep 3 */ #define UICR0_IM4 (1 << 4) /* Interrupt mask ep 4 */ #define UICR0_IM5 (1 << 5) /* Interrupt mask ep 5 */ #define UICR0_IM6 (1 << 6) /* Interrupt mask ep 6 */ #define UICR0_IM7 (1 << 7) /* Interrupt mask ep 7 */ #define UICR1_IM8 (1 << 0) /* Interrupt mask ep 8 */ #define UICR1_IM9 (1 << 1) /* Interrupt mask ep 9 */ #define UICR1_IM10 (1 << 2) /* Interrupt mask ep 10 */ #define UICR1_IM11 (1 << 3) /* Interrupt mask ep 11 */ #define UICR1_IM12 (1 << 4) /* Interrupt mask ep 12 */ #define UICR1_IM13 (1 << 5) /* Interrupt mask ep 13 */ #define UICR1_IM14 (1 << 6) /* Interrupt mask ep 14 */ #define UICR1_IM15 (1 << 7) /* Interrupt mask ep 15 */ #define USIR0_IR0 (1 << 0) /* Interrupt request ep 0 */ #define USIR0_IR1 (1 << 1) /* Interrupt request ep 1 */ #define USIR0_IR2 (1 << 2) /* Interrupt request ep 2 */ #define USIR0_IR3 (1 << 3) /* Interrupt request ep 3 */ #define USIR0_IR4 (1 << 4) /* Interrupt request ep 4 */ #define USIR0_IR5 (1 << 5) /* Interrupt request ep 5 */ #define USIR0_IR6 (1 << 6) /* Interrupt request ep 6 */ #define USIR0_IR7 (1 << 7) /* Interrupt request ep 7 */ #define USIR1_IR8 (1 << 0) /* Interrupt request ep 8 */ #define USIR1_IR9 (1 << 1) /* Interrupt request ep 9 */ #define USIR1_IR10 (1 << 2) /* Interrupt request ep 10 */ #define USIR1_IR11 (1 << 3) /* Interrupt request ep 11 */ #define USIR1_IR12 (1 << 4) /* Interrupt request ep 12 */ #define USIR1_IR13 (1 << 5) /* Interrupt request ep 13 */ #define USIR1_IR14 (1 << 6) /* Interrupt request ep 14 */ #define USIR1_IR15 (1 << 7) /* Interrupt request ep 15 */ /* * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x * series processors. The UDC for the IXP 4xx series is very similar. * There are fifteen endpoints, in addition to ep0. * * Such controller drivers work with a gadget driver. The gadget driver * returns descriptors, implements configuration and data protocols used * by the host to interact with this device, and allocates endpoints to * the different protocol interfaces. The controller driver virtualizes * usb hardware so that the gadget drivers will be more portable. * * This UDC hardware wants to implement a bit too much USB protocol, so * it constrains the sorts of USB configuration change events that work. * The errata for these chips are misleading; some "fixed" bugs from * pxa250 a0/a1 b0/b1/b2 sure act like they're still there. * * Note that the UDC hardware supports DMA (except on IXP) but that's * not used here. IN-DMA (to host) is simple enough, when the data is * suitably aligned (16 bytes) ... the network stack doesn't do that, * other software can. OUT-DMA is buggy in most chip versions, as well * as poorly designed (data toggle not automatic). So this driver won't * bother using DMA. (Mostly-working IN-DMA support was available in * kernels before 2.6.23, but was never enabled or well tested.) */ #define DRIVER_VERSION "30-June-2007" #define DRIVER_DESC "PXA 25x USB Device Controller driver" static const char driver_name [] = "pxa25x_udc"; static const char ep0name [] = "ep0"; #ifdef CONFIG_ARCH_IXP4XX /* cpu-specific register addresses are compiled in to this code */ #ifdef CONFIG_ARCH_PXA #error "Can't configure both IXP and PXA" #endif /* IXP doesn't yet support */ #define clk_get(dev,name) NULL #define clk_enable(clk) do { } while (0) #define clk_disable(clk) do { } while (0) #define clk_put(clk) do { } while (0) #endif #include "pxa25x_udc.h" #ifdef CONFIG_USB_PXA25X_SMALL #define SIZE_STR " (small)" #else #define SIZE_STR "" #endif /* --------------------------------------------------------------------------- * endpoint related parts of the api to the usb controller hardware, * used by gadget driver; and the inner talker-to-hardware core. * --------------------------------------------------------------------------- */ static void pxa25x_ep_fifo_flush (struct usb_ep *ep); static void nuke (struct pxa25x_ep *, int status); /* one GPIO should control a D+ pullup, so host sees this device (or not) */ static void pullup_off(void) { struct pxa2xx_udc_mach_info *mach = the_controller->mach; int off_level = mach->gpio_pullup_inverted; if (gpio_is_valid(mach->gpio_pullup)) gpio_set_value(mach->gpio_pullup, off_level); else if (mach->udc_command) mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT); } static void pullup_on(void) { struct pxa2xx_udc_mach_info *mach = the_controller->mach; int on_level = !mach->gpio_pullup_inverted; if (gpio_is_valid(mach->gpio_pullup)) gpio_set_value(mach->gpio_pullup, on_level); else if (mach->udc_command) mach->udc_command(PXA2XX_UDC_CMD_CONNECT); } #if defined(CONFIG_CPU_BIG_ENDIAN) /* * IXP4xx has its buses wired up in a way that relies on never doing any * byte swaps, independent of whether it runs in big-endian or little-endian * mode, as explained by Krzysztof Hałasa. * * We only support pxa25x in little-endian mode, but it is very likely * that it works the same way. */ static inline void udc_set_reg(struct pxa25x_udc *dev, u32 reg, u32 val) { iowrite32be(val, dev->regs + reg); } static inline u32 udc_get_reg(struct pxa25x_udc *dev, u32 reg) { return ioread32be(dev->regs + reg); } #else static inline void udc_set_reg(struct pxa25x_udc *dev, u32 reg, u32 val) { writel(val, dev->regs + reg); } static inline u32 udc_get_reg(struct pxa25x_udc *dev, u32 reg) { return readl(dev->regs + reg); } #endif static void pio_irq_enable(struct pxa25x_ep *ep) { u32 bEndpointAddress = ep->bEndpointAddress & 0xf; if (bEndpointAddress < 8) udc_set_reg(ep->dev, UICR0, udc_get_reg(ep->dev, UICR0) & ~(1 << bEndpointAddress)); else { bEndpointAddress -= 8; udc_set_reg(ep->dev, UICR1, udc_get_reg(ep->dev, UICR1) & ~(1 << bEndpointAddress)); } } static void pio_irq_disable(struct pxa25x_ep *ep) { u32 bEndpointAddress = ep->bEndpointAddress & 0xf; if (bEndpointAddress < 8) udc_set_reg(ep->dev, UICR0, udc_get_reg(ep->dev, UICR0) | (1 << bEndpointAddress)); else { bEndpointAddress -= 8; udc_set_reg(ep->dev, UICR1, udc_get_reg(ep->dev, UICR1) | (1 << bEndpointAddress)); } } /* The UDCCR reg contains mask and interrupt status bits, * so using '|=' isn't safe as it may ack an interrupt. */ #define UDCCR_MASK_BITS (UDCCR_REM | UDCCR_SRM | UDCCR_UDE) static inline void udc_set_mask_UDCCR(struct pxa25x_udc *dev, int mask) { u32 udccr = udc_get_reg(dev, UDCCR); udc_set_reg(dev, (udccr & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS), UDCCR); } static inline void udc_clear_mask_UDCCR(struct pxa25x_udc *dev, int mask) { u32 udccr = udc_get_reg(dev, UDCCR); udc_set_reg(dev, (udccr & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS), UDCCR); } static inline void udc_ack_int_UDCCR(struct pxa25x_udc *dev, int mask) { /* udccr contains the bits we dont want to change */ u32 udccr = udc_get_reg(dev, UDCCR) & UDCCR_MASK_BITS; udc_set_reg(dev, udccr | (mask & ~UDCCR_MASK_BITS), UDCCR); } static inline u32 udc_ep_get_UDCCS(struct pxa25x_ep *ep) { return udc_get_reg(ep->dev, ep->regoff_udccs); } static inline void udc_ep_set_UDCCS(struct pxa25x_ep *ep, u32 data) { udc_set_reg(ep->dev, data, ep->regoff_udccs); } static inline u32 udc_ep0_get_UDCCS(struct pxa25x_udc *dev) { return udc_get_reg(dev, UDCCS0); } static inline void udc_ep0_set_UDCCS(struct pxa25x_udc *dev, u32 data) { udc_set_reg(dev, data, UDCCS0); } static inline u32 udc_ep_get_UDDR(struct pxa25x_ep *ep) { return udc_get_reg(ep->dev, ep->regoff_uddr); } static inline void udc_ep_set_UDDR(struct pxa25x_ep *ep, u32 data) { udc_set_reg(ep->dev, data, ep->regoff_uddr); } static inline u32 udc_ep_get_UBCR(struct pxa25x_ep *ep) { return udc_get_reg(ep->dev, ep->regoff_ubcr); } /* * endpoint enable/disable * * we need to verify the descriptors used to enable endpoints. since pxa25x * endpoint configurations are fixed, and are pretty much always enabled, * there's not a lot to manage here. * * because pxa25x can't selectively initialize bulk (or interrupt) endpoints, * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except * for a single interface (with only the default altsetting) and for gadget * drivers that don't halt endpoints (not reset by set_interface). that also * means that if you use ISO, you must violate the USB spec rule that all * iso endpoints must be in non-default altsettings. */ static int pxa25x_ep_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) { struct pxa25x_ep *ep; struct pxa25x_udc *dev; ep = container_of (_ep, struct pxa25x_ep, ep); if (!_ep || !desc || _ep->name == ep0name || desc->bDescriptorType != USB_DT_ENDPOINT || ep->bEndpointAddress != desc->bEndpointAddress || ep->fifo_size < usb_endpoint_maxp (desc)) { DMSG("%s, bad ep or descriptor\n", __func__); return -EINVAL; } /* xfer types must match, except that interrupt ~= bulk */ if (ep->bmAttributes != desc->bmAttributes && ep->bmAttributes != USB_ENDPOINT_XFER_BULK && desc->bmAttributes != USB_ENDPOINT_XFER_INT) { DMSG("%s, %s type mismatch\n", __func__, _ep->name); return -EINVAL; } /* hardware _could_ do smaller, but driver doesn't */ if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK && usb_endpoint_maxp (desc) != BULK_FIFO_SIZE) || !desc->wMaxPacketSize) { DMSG("%s, bad %s maxpacket\n", __func__, _ep->name); return -ERANGE; } dev = ep->dev; if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { DMSG("%s, bogus device state\n", __func__); return -ESHUTDOWN; } ep->ep.desc = desc; ep->stopped = 0; ep->pio_irqs = 0; ep->ep.maxpacket = usb_endpoint_maxp (desc); /* flush fifo (mostly for OUT buffers) */ pxa25x_ep_fifo_flush (_ep); /* ... reset halt state too, if we could ... */ DBG(DBG_VERBOSE, "enabled %s\n", _ep->name); return 0; } static int pxa25x_ep_disable (struct usb_ep *_ep) { struct pxa25x_ep *ep; unsigned long flags; ep = container_of (_ep, struct pxa25x_ep, ep); if (!_ep || !ep->ep.desc) { DMSG("%s, %s not enabled\n", __func__, _ep ? ep->ep.name : NULL); return -EINVAL; } local_irq_save(flags); nuke (ep, -ESHUTDOWN); /* flush fifo (mostly for IN buffers) */ pxa25x_ep_fifo_flush (_ep); ep->ep.desc = NULL; ep->stopped = 1; local_irq_restore(flags); DBG(DBG_VERBOSE, "%s disabled\n", _ep->name); return 0; } /*-------------------------------------------------------------------------*/ /* for the pxa25x, these can just wrap kmalloc/kfree. gadget drivers * must still pass correctly initialized endpoints, since other controller * drivers may care about how it's currently set up (dma issues etc). */ /* * pxa25x_ep_alloc_request - allocate a request data structure */ static struct usb_request * pxa25x_ep_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags) { struct pxa25x_request *req; req = kzalloc(sizeof(*req), gfp_flags); if (!req) return NULL; INIT_LIST_HEAD (&req->queue); return &req->req; } /* * pxa25x_ep_free_request - deallocate a request data structure */ static void pxa25x_ep_free_request (struct usb_ep *_ep, struct usb_request *_req) { struct pxa25x_request *req; req = container_of (_req, struct pxa25x_request, req); WARN_ON(!list_empty (&req->queue)); kfree(req); } /*-------------------------------------------------------------------------*/ /* * done - retire a request; caller blocked irqs */ static void done(struct pxa25x_ep *ep, struct pxa25x_request *req, int status) { unsigned stopped = ep->stopped; list_del_init(&req->queue); if (likely (req->req.status == -EINPROGRESS)) req->req.status = status; else status = req->req.status; if (status && status != -ESHUTDOWN) DBG(DBG_VERBOSE, "complete %s req %p stat %d len %u/%u\n", ep->ep.name, &req->req, status, req->req.actual, req->req.length); /* don't modify queue heads during completion callback */ ep->stopped = 1; usb_gadget_giveback_request(&ep->ep, &req->req); ep->stopped = stopped; } static inline void ep0_idle (struct pxa25x_udc *dev) { dev->ep0state = EP0_IDLE; } static int write_packet(struct pxa25x_ep *ep, struct pxa25x_request *req, unsigned max) { u8 *buf; unsigned length, count; buf = req->req.buf + req->req.actual; prefetch(buf); /* how big will this packet be? */ length = min(req->req.length - req->req.actual, max); req->req.actual += length; count = length; while (likely(count--)) udc_ep_set_UDDR(ep, *buf++); return length; } /* * write to an IN endpoint fifo, as many packets as possible. * irqs will use this to write the rest later. * caller guarantees at least one packet buffer is ready (or a zlp). */ static int write_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req) { unsigned max; max = usb_endpoint_maxp(ep->ep.desc); do { unsigned count; int is_last, is_short; count = write_packet(ep, req, max); /* last packet is usually short (or a zlp) */ if (unlikely (count != max)) is_last = is_short = 1; else { if (likely(req->req.length != req->req.actual) || req->req.zero) is_last = 0; else is_last = 1; /* interrupt/iso maxpacket may not fill the fifo */ is_short = unlikely (max < ep->fifo_size); } DBG(DBG_VERY_NOISY, "wrote %s %d bytes%s%s %d left %p\n", ep->ep.name, count, is_last ? "/L" : "", is_short ? "/S" : "", req->req.length - req->req.actual, req); /* let loose that packet. maybe try writing another one, * double buffering might work. TSP, TPC, and TFS * bit values are the same for all normal IN endpoints. */ udc_ep_set_UDCCS(ep, UDCCS_BI_TPC); if (is_short) udc_ep_set_UDCCS(ep, UDCCS_BI_TSP); /* requests complete when all IN data is in the FIFO */ if (is_last) { done (ep, req, 0); if (list_empty(&ep->queue)) pio_irq_disable(ep); return 1; } // TODO experiment: how robust can fifo mode tweaking be? // double buffering is off in the default fifo mode, which // prevents TFS from being set here. } while (udc_ep_get_UDCCS(ep) & UDCCS_BI_TFS); return 0; } /* caller asserts req->pending (ep0 irq status nyet cleared); starts * ep0 data stage. these chips want very simple state transitions. */ static inline void ep0start(struct pxa25x_udc *dev, u32 flags, const char *tag) { udc_ep0_set_UDCCS(dev, flags|UDCCS0_SA|UDCCS0_OPR); udc_set_reg(dev, USIR0, USIR0_IR0); dev->req_pending = 0; DBG(DBG_VERY_NOISY, "%s %s, %02x/%02x\n", __func__, tag, udc_ep0_get_UDCCS(dev), flags); } static int write_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req) { struct pxa25x_udc *dev = ep->dev; unsigned count; int is_short; count = write_packet(&dev->ep[0], req, EP0_FIFO_SIZE); ep->dev->stats.write.bytes += count; /* last packet "must be" short (or a zlp) */ is_short = (count != EP0_FIFO_SIZE); DBG(DBG_VERY_NOISY, "ep0in %d bytes %d left %p\n", count, req->req.length - req->req.actual, req); if (unlikely (is_short)) { if (ep->dev->req_pending) ep0start(ep->dev, UDCCS0_IPR, "short IN"); else udc_ep0_set_UDCCS(dev, UDCCS0_IPR); count = req->req.length; done (ep, req, 0); ep0_idle(ep->dev); #ifndef CONFIG_ARCH_IXP4XX #if 1 /* This seems to get rid of lost status irqs in some cases: * host responds quickly, or next request involves config * change automagic, or should have been hidden, or ... * * FIXME get rid of all udelays possible... */ if (count >= EP0_FIFO_SIZE) { count = 100; do { if ((udc_ep0_get_UDCCS(dev) & UDCCS0_OPR) != 0) { /* clear OPR, generate ack */ udc_ep0_set_UDCCS(dev, UDCCS0_OPR); break; } count--; udelay(1); } while (count); } #endif #endif } else if (ep->dev->req_pending) ep0start(ep->dev, 0, "IN"); return is_short; } /* * read_fifo - unload packet(s) from the fifo we use for usb OUT * transfers and put them into the request. caller should have made * sure there's at least one packet ready. * * returns true if the request completed because of short packet or the * request buffer having filled (and maybe overran till end-of-packet). */ static int read_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req) { for (;;) { u32 udccs; u8 *buf; unsigned bufferspace, count, is_short; /* make sure there's a packet in the FIFO. * UDCCS_{BO,IO}_RPC are all the same bit value. * UDCCS_{BO,IO}_RNE are all the same bit value. */ udccs = udc_ep_get_UDCCS(ep); if (unlikely ((udccs & UDCCS_BO_RPC) == 0)) break; buf = req->req.buf + req->req.actual; prefetchw(buf); bufferspace = req->req.length - req->req.actual; /* read all bytes from this packet */ if (likely (udccs & UDCCS_BO_RNE)) { count = 1 + (0x0ff & udc_ep_get_UBCR(ep)); req->req.actual += min (count, bufferspace); } else /* zlp */ count = 0; is_short = (count < ep->ep.maxpacket); DBG(DBG_VERY_NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n", ep->ep.name, udccs, count, is_short ? "/S" : "", req, req->req.actual, req->req.length); while (likely (count-- != 0)) { u8 byte = (u8) udc_ep_get_UDDR(ep); if (unlikely (bufferspace == 0)) { /* this happens when the driver's buffer * is smaller than what the host sent. * discard the extra data. */ if (req->req.status != -EOVERFLOW) DMSG("%s overflow %d\n", ep->ep.name, count); req->req.status = -EOVERFLOW; } else { *buf++ = byte; bufferspace--; } } udc_ep_set_UDCCS(ep, UDCCS_BO_RPC); /* RPC/RSP/RNE could now reflect the other packet buffer */ /* iso is one request per packet */ if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) { if (udccs & UDCCS_IO_ROF) req->req.status = -EHOSTUNREACH; /* more like "is_done" */ is_short = 1; } /* completion */ if (is_short || req->req.actual == req->req.length) { done (ep, req, 0); if (list_empty(&ep->queue)) pio_irq_disable(ep); return 1; } /* finished that packet. the next one may be waiting... */ } return 0; } /* * special ep0 version of the above. no UBCR0 or double buffering; status * handshaking is magic. most device protocols don't need control-OUT. * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other * protocols do use them. */ static int read_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req) { u8 *buf, byte; unsigned bufferspace; buf = req->req.buf + req->req.actual; bufferspace = req->req.length - req->req.actual; while (udc_ep_get_UDCCS(ep) & UDCCS0_RNE) { byte = (u8) UDDR0; if (unlikely (bufferspace == 0)) { /* this happens when the driver's buffer * is smaller than what the host sent. * discard the extra data. */ if (req->req.status != -EOVERFLOW) DMSG("%s overflow\n", ep->ep.name); req->req.status = -EOVERFLOW; } else { *buf++ = byte; req->req.actual++; bufferspace--; } } udc_ep_set_UDCCS(ep, UDCCS0_OPR | UDCCS0_IPR); /* completion */ if (req->req.actual >= req->req.length) return 1; /* finished that packet. the next one may be waiting... */ return 0; } /*-------------------------------------------------------------------------*/ static int pxa25x_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) { struct pxa25x_request *req; struct pxa25x_ep *ep; struct pxa25x_udc *dev; unsigned long flags; req = container_of(_req, struct pxa25x_request, req); if (unlikely (!_req || !_req->complete || !_req->buf || !list_empty(&req->queue))) { DMSG("%s, bad params\n", __func__); return -EINVAL; } ep = container_of(_ep, struct pxa25x_ep, ep); if (unlikely(!_ep || (!ep->ep.desc && ep->ep.name != ep0name))) { DMSG("%s, bad ep\n", __func__); return -EINVAL; } dev = ep->dev; if (unlikely (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) { DMSG("%s, bogus device state\n", __func__); return -ESHUTDOWN; } /* iso is always one packet per request, that's the only way * we can report per-packet status. that also helps with dma. */ if (unlikely (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC && req->req.length > usb_endpoint_maxp(ep->ep.desc))) return -EMSGSIZE; DBG(DBG_NOISY, "%s queue req %p, len %d buf %p\n", _ep->name, _req, _req->length, _req->buf); local_irq_save(flags); _req->status = -EINPROGRESS; _req->actual = 0; /* kickstart this i/o queue? */ if (list_empty(&ep->queue) && !ep->stopped) { if (ep->ep.desc == NULL/* ep0 */) { unsigned length = _req->length; switch (dev->ep0state) { case EP0_IN_DATA_PHASE: dev->stats.write.ops++; if (write_ep0_fifo(ep, req)) req = NULL; break; case EP0_OUT_DATA_PHASE: dev->stats.read.ops++; /* messy ... */ if (dev->req_config) { DBG(DBG_VERBOSE, "ep0 config ack%s\n", dev->has_cfr ? "" : " raced"); if (dev->has_cfr) udc_set_reg(dev, UDCCFR, UDCCFR_AREN | UDCCFR_ACM | UDCCFR_MB1); done(ep, req, 0); dev->ep0state = EP0_END_XFER; local_irq_restore (flags); return 0; } if (dev->req_pending) ep0start(dev, UDCCS0_IPR, "OUT"); if (length == 0 || ((udc_ep0_get_UDCCS(dev) & UDCCS0_RNE) != 0 && read_ep0_fifo(ep, req))) { ep0_idle(dev); done(ep, req, 0); req = NULL; } break; default: DMSG("ep0 i/o, odd state %d\n", dev->ep0state); local_irq_restore (flags); return -EL2HLT; } /* can the FIFO can satisfy the request immediately? */ } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) { if ((udc_ep_get_UDCCS(ep) & UDCCS_BI_TFS) != 0 && write_fifo(ep, req)) req = NULL; } else if ((udc_ep_get_UDCCS(ep) & UDCCS_BO_RFS) != 0 && read_fifo(ep, req)) { req = NULL; } if (likely(req && ep->ep.desc)) pio_irq_enable(ep); } /* pio or dma irq handler advances the queue. */ if (likely(req != NULL)) list_add_tail(&req->queue, &ep->queue); local_irq_restore(flags); return 0; } /* * nuke - dequeue ALL requests */ static void nuke(struct pxa25x_ep *ep, int status) { struct pxa25x_request *req; /* called with irqs blocked */ while (!list_empty(&ep->queue)) { req = list_entry(ep->queue.next, struct pxa25x_request, queue); done(ep, req, status); } if (ep->ep.desc) pio_irq_disable(ep); } /* dequeue JUST ONE request */ static int pxa25x_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) { struct pxa25x_ep *ep; struct pxa25x_request *req; unsigned long flags; ep = container_of(_ep, struct pxa25x_ep, ep); if (!_ep || ep->ep.name == ep0name) return -EINVAL; local_irq_save(flags); /* make sure it's actually queued on this endpoint */ list_for_each_entry (req, &ep->queue, queue) { if (&req->req == _req) break; } if (&req->req != _req) { local_irq_restore(flags); return -EINVAL; } done(ep, req, -ECONNRESET); local_irq_restore(flags); return 0; } /*-------------------------------------------------------------------------*/ static int pxa25x_ep_set_halt(struct usb_ep *_ep, int value) { struct pxa25x_ep *ep; unsigned long flags; ep = container_of(_ep, struct pxa25x_ep, ep); if (unlikely (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) || ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) { DMSG("%s, bad ep\n", __func__); return -EINVAL; } if (value == 0) { /* this path (reset toggle+halt) is needed to implement * SET_INTERFACE on normal hardware. but it can't be * done from software on the PXA UDC, and the hardware * forgets to do it as part of SET_INTERFACE automagic. */ DMSG("only host can clear %s halt\n", _ep->name); return -EROFS; } local_irq_save(flags); if ((ep->bEndpointAddress & USB_DIR_IN) != 0 && ((udc_ep_get_UDCCS(ep) & UDCCS_BI_TFS) == 0 || !list_empty(&ep->queue))) { local_irq_restore(flags); return -EAGAIN; } /* FST bit is the same for control, bulk in, bulk out, interrupt in */ udc_ep_set_UDCCS(ep, UDCCS_BI_FST|UDCCS_BI_FTF); /* ep0 needs special care */ if (!ep->ep.desc) { start_watchdog(ep->dev); ep->dev->req_pending = 0; ep->dev->ep0state = EP0_STALL; /* and bulk/intr endpoints like dropping stalls too */ } else { unsigned i; for (i = 0; i < 1000; i += 20) { if (udc_ep_get_UDCCS(ep) & UDCCS_BI_SST) break; udelay(20); } } local_irq_restore(flags); DBG(DBG_VERBOSE, "%s halt\n", _ep->name); return 0; } static int pxa25x_ep_fifo_status(struct usb_ep *_ep) { struct pxa25x_ep *ep; ep = container_of(_ep, struct pxa25x_ep, ep); if (!_ep) { DMSG("%s, bad ep\n", __func__); return -ENODEV; } /* pxa can't report unclaimed bytes from IN fifos */ if ((ep->bEndpointAddress & USB_DIR_IN) != 0) return -EOPNOTSUPP; if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN || (udc_ep_get_UDCCS(ep) & UDCCS_BO_RFS) == 0) return 0; else return (udc_ep_get_UBCR(ep) & 0xfff) + 1; } static void pxa25x_ep_fifo_flush(struct usb_ep *_ep) { struct pxa25x_ep *ep; ep = container_of(_ep, struct pxa25x_ep, ep); if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) { DMSG("%s, bad ep\n", __func__); return; } /* toggle and halt bits stay unchanged */ /* for OUT, just read and discard the FIFO contents. */ if ((ep->bEndpointAddress & USB_DIR_IN) == 0) { while (((udc_ep_get_UDCCS(ep)) & UDCCS_BO_RNE) != 0) (void)udc_ep_get_UDDR(ep); return; } /* most IN status is the same, but ISO can't stall */ udc_ep_set_UDCCS(ep, UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR | (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC ? 0 : UDCCS_BI_SST)); } static const struct usb_ep_ops pxa25x_ep_ops = { .enable = pxa25x_ep_enable, .disable = pxa25x_ep_disable, .alloc_request = pxa25x_ep_alloc_request, .free_request = pxa25x_ep_free_request, .queue = pxa25x_ep_queue, .dequeue = pxa25x_ep_dequeue, .set_halt = pxa25x_ep_set_halt, .fifo_status = pxa25x_ep_fifo_status, .fifo_flush = pxa25x_ep_fifo_flush, }; /* --------------------------------------------------------------------------- * device-scoped parts of the api to the usb controller hardware * --------------------------------------------------------------------------- */ static int pxa25x_udc_get_frame(struct usb_gadget *_gadget) { struct pxa25x_udc *dev; dev = container_of(_gadget, struct pxa25x_udc, gadget); return ((udc_get_reg(dev, UFNRH) & 0x07) << 8) | (udc_get_reg(dev, UFNRL) & 0xff); } static int pxa25x_udc_wakeup(struct usb_gadget *_gadget) { struct pxa25x_udc *udc; udc = container_of(_gadget, struct pxa25x_udc, gadget); /* host may not have enabled remote wakeup */ if ((udc_ep0_get_UDCCS(udc) & UDCCS0_DRWF) == 0) return -EHOSTUNREACH; udc_set_mask_UDCCR(udc, UDCCR_RSM); return 0; } static void stop_activity(struct pxa25x_udc *, struct usb_gadget_driver *); static void udc_enable (struct pxa25x_udc *); static void udc_disable(struct pxa25x_udc *); /* We disable the UDC -- and its 48 MHz clock -- whenever it's not * in active use. */ static int pullup(struct pxa25x_udc *udc) { int is_active = udc->vbus && udc->pullup && !udc->suspended; DMSG("%s\n", is_active ? "active" : "inactive"); if (is_active) { if (!udc->active) { udc->active = 1; /* Enable clock for USB device */ clk_enable(udc->clk); udc_enable(udc); } } else { if (udc->active) { if (udc->gadget.speed != USB_SPEED_UNKNOWN) { DMSG("disconnect %s\n", udc->driver ? udc->driver->driver.name : "(no driver)"); stop_activity(udc, udc->driver); } udc_disable(udc); /* Disable clock for USB device */ clk_disable(udc->clk); udc->active = 0; } } return 0; } /* VBUS reporting logically comes from a transceiver */ static int pxa25x_udc_vbus_session(struct usb_gadget *_gadget, int is_active) { struct pxa25x_udc *udc; udc = container_of(_gadget, struct pxa25x_udc, gadget); udc->vbus = is_active; DMSG("vbus %s\n", is_active ? "supplied" : "inactive"); pullup(udc); return 0; } /* drivers may have software control over D+ pullup */ static int pxa25x_udc_pullup(struct usb_gadget *_gadget, int is_active) { struct pxa25x_udc *udc; udc = container_of(_gadget, struct pxa25x_udc, gadget); /* not all boards support pullup control */ if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command) return -EOPNOTSUPP; udc->pullup = (is_active != 0); pullup(udc); return 0; } /* boards may consume current from VBUS, up to 100-500mA based on config. * the 500uA suspend ceiling means that exclusively vbus-powered PXA designs * violate USB specs. */ static int pxa25x_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA) { struct pxa25x_udc *udc; udc = container_of(_gadget, struct pxa25x_udc, gadget); if (!IS_ERR_OR_NULL(udc->transceiver)) return usb_phy_set_power(udc->transceiver, mA); return -EOPNOTSUPP; } static int pxa25x_udc_start(struct usb_gadget *g, struct usb_gadget_driver *driver); static int pxa25x_udc_stop(struct usb_gadget *g); static const struct usb_gadget_ops pxa25x_udc_ops = { .get_frame = pxa25x_udc_get_frame, .wakeup = pxa25x_udc_wakeup, .vbus_session = pxa25x_udc_vbus_session, .pullup = pxa25x_udc_pullup, .vbus_draw = pxa25x_udc_vbus_draw, .udc_start = pxa25x_udc_start, .udc_stop = pxa25x_udc_stop, }; /*-------------------------------------------------------------------------*/ #ifdef CONFIG_USB_GADGET_DEBUG_FS static int udc_debug_show(struct seq_file *m, void *_d) { struct pxa25x_udc *dev = m->private; unsigned long flags; int i; u32 tmp; local_irq_save(flags); /* basic device status */ seq_printf(m, DRIVER_DESC "\n" "%s version: %s\nGadget driver: %s\nHost %s\n\n", driver_name, DRIVER_VERSION SIZE_STR "(pio)", dev->driver ? dev->driver->driver.name : "(none)", dev->gadget.speed == USB_SPEED_FULL ? "full speed" : "disconnected"); /* registers for device and ep0 */ seq_printf(m, "uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n", udc_get_reg(dev, UICR1), udc_get_reg(dev, UICR0), udc_get_reg(dev, USIR1), udc_get_reg(dev, USIR0), udc_get_reg(dev, UFNRH), udc_get_reg(dev, UFNRL)); tmp = udc_get_reg(dev, UDCCR); seq_printf(m, "udccr %02X =%s%s%s%s%s%s%s%s\n", tmp, (tmp & UDCCR_REM) ? " rem" : "", (tmp & UDCCR_RSTIR) ? " rstir" : "", (tmp & UDCCR_SRM) ? " srm" : "", (tmp & UDCCR_SUSIR) ? " susir" : "", (tmp & UDCCR_RESIR) ? " resir" : "", (tmp & UDCCR_RSM) ? " rsm" : "", (tmp & UDCCR_UDA) ? " uda" : "", (tmp & UDCCR_UDE) ? " ude" : ""); tmp = udc_ep0_get_UDCCS(dev); seq_printf(m, "udccs0 %02X =%s%s%s%s%s%s%s%s\n", tmp, (tmp & UDCCS0_SA) ? " sa" : "", (tmp & UDCCS0_RNE) ? " rne" : "", (tmp & UDCCS0_FST) ? " fst" : "", (tmp & UDCCS0_SST) ? " sst" : "", (tmp & UDCCS0_DRWF) ? " dwrf" : "", (tmp & UDCCS0_FTF) ? " ftf" : "", (tmp & UDCCS0_IPR) ? " ipr" : "", (tmp & UDCCS0_OPR) ? " opr" : ""); if (dev->has_cfr) { tmp = udc_get_reg(dev, UDCCFR); seq_printf(m, "udccfr %02X =%s%s\n", tmp, (tmp & UDCCFR_AREN) ? " aren" : "", (tmp & UDCCFR_ACM) ? " acm" : ""); } if (dev->gadget.speed != USB_SPEED_FULL || !dev->driver) goto done; seq_printf(m, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n", dev->stats.write.bytes, dev->stats.write.ops, dev->stats.read.bytes, dev->stats.read.ops, dev->stats.irqs); /* dump endpoint queues */ for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) { struct pxa25x_ep *ep = &dev->ep [i]; struct pxa25x_request *req; if (i != 0) { const struct usb_endpoint_descriptor *desc; desc = ep->ep.desc; if (!desc) continue; tmp = udc_ep_get_UDCCS(&dev->ep[i]); seq_printf(m, "%s max %d %s udccs %02x irqs %lu\n", ep->ep.name, usb_endpoint_maxp(desc), "pio", tmp, ep->pio_irqs); /* TODO translate all five groups of udccs bits! */ } else /* ep0 should only have one transfer queued */ seq_printf(m, "ep0 max 16 pio irqs %lu\n", ep->pio_irqs); if (list_empty(&ep->queue)) { seq_printf(m, "\t(nothing queued)\n"); continue; } list_for_each_entry(req, &ep->queue, queue) { seq_printf(m, "\treq %p len %d/%d buf %p\n", &req->req, req->req.actual, req->req.length, req->req.buf); } } done: local_irq_restore(flags); return 0; } DEFINE_SHOW_ATTRIBUTE(udc_debug); #define create_debug_files(dev) \ do { \ debugfs_create_file(dev->gadget.name, \ S_IRUGO, NULL, dev, &udc_debug_fops); \ } while (0) #define remove_debug_files(dev) debugfs_remove(debugfs_lookup(dev->gadget.name, NULL)) #else /* !CONFIG_USB_GADGET_DEBUG_FILES */ #define create_debug_files(dev) do {} while (0) #define remove_debug_files(dev) do {} while (0) #endif /* CONFIG_USB_GADGET_DEBUG_FILES */ /*-------------------------------------------------------------------------*/ /* * udc_disable - disable USB device controller */ static void udc_disable(struct pxa25x_udc *dev) { /* block all irqs */ udc_set_mask_UDCCR(dev, UDCCR_SRM|UDCCR_REM); udc_set_reg(dev, UICR0, 0xff); udc_set_reg(dev, UICR1, 0xff); udc_set_reg(dev, UFNRH, UFNRH_SIM); /* if hardware supports it, disconnect from usb */ pullup_off(); udc_clear_mask_UDCCR(dev, UDCCR_UDE); ep0_idle (dev); dev->gadget.speed = USB_SPEED_UNKNOWN; } /* * udc_reinit - initialize software state */ static void udc_reinit(struct pxa25x_udc *dev) { u32 i; /* device/ep0 records init */ INIT_LIST_HEAD (&dev->gadget.ep_list); INIT_LIST_HEAD (&dev->gadget.ep0->ep_list); dev->ep0state = EP0_IDLE; dev->gadget.quirk_altset_not_supp = 1; /* basic endpoint records init */ for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) { struct pxa25x_ep *ep = &dev->ep[i]; if (i != 0) list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list); ep->ep.desc = NULL; ep->stopped = 0; INIT_LIST_HEAD (&ep->queue); ep->pio_irqs = 0; usb_ep_set_maxpacket_limit(&ep->ep, ep->ep.maxpacket); } /* the rest was statically initialized, and is read-only */ } /* until it's enabled, this UDC should be completely invisible * to any USB host. */ static void udc_enable (struct pxa25x_udc *dev) { udc_clear_mask_UDCCR(dev, UDCCR_UDE); /* try to clear these bits before we enable the udc */ udc_ack_int_UDCCR(dev, UDCCR_SUSIR|/*UDCCR_RSTIR|*/UDCCR_RESIR); ep0_idle(dev); dev->gadget.speed = USB_SPEED_UNKNOWN; dev->stats.irqs = 0; /* * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual: * - enable UDC * - if RESET is already in progress, ack interrupt * - unmask reset interrupt */ udc_set_mask_UDCCR(dev, UDCCR_UDE); if (!(udc_get_reg(dev, UDCCR) & UDCCR_UDA)) udc_ack_int_UDCCR(dev, UDCCR_RSTIR); if (dev->has_cfr /* UDC_RES2 is defined */) { /* pxa255 (a0+) can avoid a set_config race that could * prevent gadget drivers from configuring correctly */ udc_set_reg(dev, UDCCFR, UDCCFR_ACM | UDCCFR_MB1); } else { /* "USB test mode" for pxa250 errata 40-42 (stepping a0, a1) * which could result in missing packets and interrupts. * supposedly one bit per endpoint, controlling whether it * double buffers or not; ACM/AREN bits fit into the holes. * zero bits (like USIR0_IRx) disable double buffering. */ udc_set_reg(dev, UDC_RES1, 0x00); udc_set_reg(dev, UDC_RES2, 0x00); } /* enable suspend/resume and reset irqs */ udc_clear_mask_UDCCR(dev, UDCCR_SRM | UDCCR_REM); /* enable ep0 irqs */ udc_set_reg(dev, UICR0, udc_get_reg(dev, UICR0) & ~UICR0_IM0); /* if hardware supports it, pullup D+ and wait for reset */ pullup_on(); } /* when a driver is successfully registered, it will receive * control requests including set_configuration(), which enables * non-control requests. then usb traffic follows until a * disconnect is reported. then a host may connect again, or * the driver might get unbound. */ static int pxa25x_udc_start(struct usb_gadget *g, struct usb_gadget_driver *driver) { struct pxa25x_udc *dev = to_pxa25x(g); int retval; /* first hook up the driver ... */ dev->driver = driver; dev->pullup = 1; /* ... then enable host detection and ep0; and we're ready * for set_configuration as well as eventual disconnect. */ /* connect to bus through transceiver */ if (!IS_ERR_OR_NULL(dev->transceiver)) { retval = otg_set_peripheral(dev->transceiver->otg, &dev->gadget); if (retval) goto bind_fail; } dump_state(dev); return 0; bind_fail: return retval; } static void reset_gadget(struct pxa25x_udc *dev, struct usb_gadget_driver *driver) { int i; /* don't disconnect drivers more than once */ if (dev->gadget.speed == USB_SPEED_UNKNOWN) driver = NULL; dev->gadget.speed = USB_SPEED_UNKNOWN; /* prevent new request submissions, kill any outstanding requests */ for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) { struct pxa25x_ep *ep = &dev->ep[i]; ep->stopped = 1; nuke(ep, -ESHUTDOWN); } del_timer_sync(&dev->timer); /* report reset; the driver is already quiesced */ if (driver) usb_gadget_udc_reset(&dev->gadget, driver); /* re-init driver-visible data structures */ udc_reinit(dev); } static void stop_activity(struct pxa25x_udc *dev, struct usb_gadget_driver *driver) { int i; /* don't disconnect drivers more than once */ if (dev->gadget.speed == USB_SPEED_UNKNOWN) driver = NULL; dev->gadget.speed = USB_SPEED_UNKNOWN; /* prevent new request submissions, kill any outstanding requests */ for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) { struct pxa25x_ep *ep = &dev->ep[i]; ep->stopped = 1; nuke(ep, -ESHUTDOWN); } del_timer_sync(&dev->timer); /* report disconnect; the driver is already quiesced */ if (driver) driver->disconnect(&dev->gadget); /* re-init driver-visible data structures */ udc_reinit(dev); } static int pxa25x_udc_stop(struct usb_gadget*g) { struct pxa25x_udc *dev = to_pxa25x(g); local_irq_disable(); dev->pullup = 0; stop_activity(dev, NULL); local_irq_enable(); if (!IS_ERR_OR_NULL(dev->transceiver)) (void) otg_set_peripheral(dev->transceiver->otg, NULL); dev->driver = NULL; dump_state(dev); return 0; } /*-------------------------------------------------------------------------*/ #ifdef CONFIG_ARCH_LUBBOCK /* Lubbock has separate connect and disconnect irqs. More typical designs * use one GPIO as the VBUS IRQ, and another to control the D+ pullup. */ static irqreturn_t lubbock_vbus_irq(int irq, void *_dev) { struct pxa25x_udc *dev = _dev; int vbus; dev->stats.irqs++; switch (irq) { case LUBBOCK_USB_IRQ: vbus = 1; disable_irq(LUBBOCK_USB_IRQ); enable_irq(LUBBOCK_USB_DISC_IRQ); break; case LUBBOCK_USB_DISC_IRQ: vbus = 0; disable_irq(LUBBOCK_USB_DISC_IRQ); enable_irq(LUBBOCK_USB_IRQ); break; default: return IRQ_NONE; } pxa25x_udc_vbus_session(&dev->gadget, vbus); return IRQ_HANDLED; } #endif /*-------------------------------------------------------------------------*/ static inline void clear_ep_state (struct pxa25x_udc *dev) { unsigned i; /* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint * fifos, and pending transactions mustn't be continued in any case. */ for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++) nuke(&dev->ep[i], -ECONNABORTED); } static void udc_watchdog(struct timer_list *t) { struct pxa25x_udc *dev = from_timer(dev, t, timer); local_irq_disable(); if (dev->ep0state == EP0_STALL && (udc_ep0_get_UDCCS(dev) & UDCCS0_FST) == 0 && (udc_ep0_get_UDCCS(dev) & UDCCS0_SST) == 0) { udc_ep0_set_UDCCS(dev, UDCCS0_FST|UDCCS0_FTF); DBG(DBG_VERBOSE, "ep0 re-stall\n"); start_watchdog(dev); } local_irq_enable(); } static void handle_ep0 (struct pxa25x_udc *dev) { u32 udccs0 = udc_ep0_get_UDCCS(dev); struct pxa25x_ep *ep = &dev->ep [0]; struct pxa25x_request *req; union { struct usb_ctrlrequest r; u8 raw [8]; u32 word [2]; } u; if (list_empty(&ep->queue)) req = NULL; else req = list_entry(ep->queue.next, struct pxa25x_request, queue); /* clear stall status */ if (udccs0 & UDCCS0_SST) { nuke(ep, -EPIPE); udc_ep0_set_UDCCS(dev, UDCCS0_SST); del_timer(&dev->timer); ep0_idle(dev); } /* previous request unfinished? non-error iff back-to-back ... */ if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) { nuke(ep, 0); del_timer(&dev->timer); ep0_idle(dev); } switch (dev->ep0state) { case EP0_IDLE: /* late-breaking status? */ udccs0 = udc_ep0_get_UDCCS(dev); /* start control request? */ if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE)) == (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) { int i; nuke (ep, -EPROTO); /* read SETUP packet */ for (i = 0; i < 8; i++) { if (unlikely(!(udc_ep0_get_UDCCS(dev) & UDCCS0_RNE))) { bad_setup: DMSG("SETUP %d!\n", i); goto stall; } u.raw [i] = (u8) UDDR0; } if (unlikely((udc_ep0_get_UDCCS(dev) & UDCCS0_RNE) != 0)) goto bad_setup; got_setup: DBG(DBG_VERBOSE, "SETUP %02x.%02x v%04x i%04x l%04x\n", u.r.bRequestType, u.r.bRequest, le16_to_cpu(u.r.wValue), le16_to_cpu(u.r.wIndex), le16_to_cpu(u.r.wLength)); /* cope with automagic for some standard requests. */ dev->req_std = (u.r.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD; dev->req_config = 0; dev->req_pending = 1; switch (u.r.bRequest) { /* hardware restricts gadget drivers here! */ case USB_REQ_SET_CONFIGURATION: if (u.r.bRequestType == USB_RECIP_DEVICE) { /* reflect hardware's automagic * up to the gadget driver. */ config_change: dev->req_config = 1; clear_ep_state(dev); /* if !has_cfr, there's no synch * else use AREN (later) not SA|OPR * USIR0_IR0 acts edge sensitive */ } break; /* ... and here, even more ... */ case USB_REQ_SET_INTERFACE: if (u.r.bRequestType == USB_RECIP_INTERFACE) { /* udc hardware is broken by design: * - altsetting may only be zero; * - hw resets all interfaces' eps; * - ep reset doesn't include halt(?). */ DMSG("broken set_interface (%d/%d)\n", le16_to_cpu(u.r.wIndex), le16_to_cpu(u.r.wValue)); goto config_change; } break; /* hardware was supposed to hide this */ case USB_REQ_SET_ADDRESS: if (u.r.bRequestType == USB_RECIP_DEVICE) { ep0start(dev, 0, "address"); return; } break; } if (u.r.bRequestType & USB_DIR_IN) dev->ep0state = EP0_IN_DATA_PHASE; else dev->ep0state = EP0_OUT_DATA_PHASE; i = dev->driver->setup(&dev->gadget, &u.r); if (i < 0) { /* hardware automagic preventing STALL... */ if (dev->req_config) { /* hardware sometimes neglects to tell * tell us about config change events, * so later ones may fail... */ WARNING("config change %02x fail %d?\n", u.r.bRequest, i); return; /* TODO experiment: if has_cfr, * hardware didn't ACK; maybe we * could actually STALL! */ } DBG(DBG_VERBOSE, "protocol STALL, " "%02x err %d\n", udc_ep0_get_UDCCS(dev), i); stall: /* the watchdog timer helps deal with cases * where udc seems to clear FST wrongly, and * then NAKs instead of STALLing. */ ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall"); start_watchdog(dev); dev->ep0state = EP0_STALL; /* deferred i/o == no response yet */ } else if (dev->req_pending) { if (likely(dev->ep0state == EP0_IN_DATA_PHASE || dev->req_std || u.r.wLength)) ep0start(dev, 0, "defer"); else ep0start(dev, UDCCS0_IPR, "defer/IPR"); } /* expect at least one data or status stage irq */ return; } else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA)) == (UDCCS0_OPR|UDCCS0_SA))) { unsigned i; /* pxa210/250 erratum 131 for B0/B1 says RNE lies. * still observed on a pxa255 a0. */ DBG(DBG_VERBOSE, "e131\n"); nuke(ep, -EPROTO); /* read SETUP data, but don't trust it too much */ for (i = 0; i < 8; i++) u.raw [i] = (u8) UDDR0; if ((u.r.bRequestType & USB_RECIP_MASK) > USB_RECIP_OTHER) goto stall; if (u.word [0] == 0 && u.word [1] == 0) goto stall; goto got_setup; } else { /* some random early IRQ: * - we acked FST * - IPR cleared * - OPR got set, without SA (likely status stage) */ udc_ep0_set_UDCCS(dev, udccs0 & (UDCCS0_SA|UDCCS0_OPR)); } break; case EP0_IN_DATA_PHASE: /* GET_DESCRIPTOR etc */ if (udccs0 & UDCCS0_OPR) { udc_ep0_set_UDCCS(dev, UDCCS0_OPR|UDCCS0_FTF); DBG(DBG_VERBOSE, "ep0in premature status\n"); if (req) done(ep, req, 0); ep0_idle(dev); } else /* irq was IPR clearing */ { if (req) { /* this IN packet might finish the request */ (void) write_ep0_fifo(ep, req); } /* else IN token before response was written */ } break; case EP0_OUT_DATA_PHASE: /* SET_DESCRIPTOR etc */ if (udccs0 & UDCCS0_OPR) { if (req) { /* this OUT packet might finish the request */ if (read_ep0_fifo(ep, req)) done(ep, req, 0); /* else more OUT packets expected */ } /* else OUT token before read was issued */ } else /* irq was IPR clearing */ { DBG(DBG_VERBOSE, "ep0out premature status\n"); if (req) done(ep, req, 0); ep0_idle(dev); } break; case EP0_END_XFER: if (req) done(ep, req, 0); /* ack control-IN status (maybe in-zlp was skipped) * also appears after some config change events. */ if (udccs0 & UDCCS0_OPR) udc_ep0_set_UDCCS(dev, UDCCS0_OPR); ep0_idle(dev); break; case EP0_STALL: udc_ep0_set_UDCCS(dev, UDCCS0_FST); break; } udc_set_reg(dev, USIR0, USIR0_IR0); } static void handle_ep(struct pxa25x_ep *ep) { struct pxa25x_request *req; int is_in = ep->bEndpointAddress & USB_DIR_IN; int completed; u32 udccs, tmp; do { completed = 0; if (likely (!list_empty(&ep->queue))) req = list_entry(ep->queue.next, struct pxa25x_request, queue); else req = NULL; // TODO check FST handling udccs = udc_ep_get_UDCCS(ep); if (unlikely(is_in)) { /* irq from TPC, SST, or (ISO) TUR */ tmp = UDCCS_BI_TUR; if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK)) tmp |= UDCCS_BI_SST; tmp &= udccs; if (likely (tmp)) udc_ep_set_UDCCS(ep, tmp); if (req && likely ((udccs & UDCCS_BI_TFS) != 0)) completed = write_fifo(ep, req); } else { /* irq from RPC (or for ISO, ROF) */ if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK)) tmp = UDCCS_BO_SST | UDCCS_BO_DME; else tmp = UDCCS_IO_ROF | UDCCS_IO_DME; tmp &= udccs; if (likely(tmp)) udc_ep_set_UDCCS(ep, tmp); /* fifos can hold packets, ready for reading... */ if (likely(req)) { completed = read_fifo(ep, req); } else pio_irq_disable(ep); } ep->pio_irqs++; } while (completed); } /* * pxa25x_udc_irq - interrupt handler * * avoid delays in ep0 processing. the control handshaking isn't always * under software control (pxa250c0 and the pxa255 are better), and delays * could cause usb protocol errors. */ static irqreturn_t pxa25x_udc_irq(int irq, void *_dev) { struct pxa25x_udc *dev = _dev; int handled; dev->stats.irqs++; do { u32 udccr = udc_get_reg(dev, UDCCR); handled = 0; /* SUSpend Interrupt Request */ if (unlikely(udccr & UDCCR_SUSIR)) { udc_ack_int_UDCCR(dev, UDCCR_SUSIR); handled = 1; DBG(DBG_VERBOSE, "USB suspend\n"); if (dev->gadget.speed != USB_SPEED_UNKNOWN && dev->driver && dev->driver->suspend) dev->driver->suspend(&dev->gadget); ep0_idle (dev); } /* RESume Interrupt Request */ if (unlikely(udccr & UDCCR_RESIR)) { udc_ack_int_UDCCR(dev, UDCCR_RESIR); handled = 1; DBG(DBG_VERBOSE, "USB resume\n"); if (dev->gadget.speed != USB_SPEED_UNKNOWN && dev->driver && dev->driver->resume) dev->driver->resume(&dev->gadget); } /* ReSeT Interrupt Request - USB reset */ if (unlikely(udccr & UDCCR_RSTIR)) { udc_ack_int_UDCCR(dev, UDCCR_RSTIR); handled = 1; if ((udc_get_reg(dev, UDCCR) & UDCCR_UDA) == 0) { DBG(DBG_VERBOSE, "USB reset start\n"); /* reset driver and endpoints, * in case that's not yet done */ reset_gadget(dev, dev->driver); } else { DBG(DBG_VERBOSE, "USB reset end\n"); dev->gadget.speed = USB_SPEED_FULL; memset(&dev->stats, 0, sizeof dev->stats); /* driver and endpoints are still reset */ } } else { u32 usir0 = udc_get_reg(dev, USIR0) & ~udc_get_reg(dev, UICR0); u32 usir1 = udc_get_reg(dev, USIR1) & ~udc_get_reg(dev, UICR1); int i; if (unlikely (!usir0 && !usir1)) continue; DBG(DBG_VERY_NOISY, "irq %02x.%02x\n", usir1, usir0); /* control traffic */ if (usir0 & USIR0_IR0) { dev->ep[0].pio_irqs++; handle_ep0(dev); handled = 1; } /* endpoint data transfers */ for (i = 0; i < 8; i++) { u32 tmp = 1 << i; if (i && (usir0 & tmp)) { handle_ep(&dev->ep[i]); udc_set_reg(dev, USIR0, udc_get_reg(dev, USIR0) | tmp); handled = 1; } #ifndef CONFIG_USB_PXA25X_SMALL if (usir1 & tmp) { handle_ep(&dev->ep[i+8]); udc_set_reg(dev, USIR1, udc_get_reg(dev, USIR1) | tmp); handled = 1; } #endif } } /* we could also ask for 1 msec SOF (SIR) interrupts */ } while (handled); return IRQ_HANDLED; } /*-------------------------------------------------------------------------*/ static void nop_release (struct device *dev) { DMSG("%s %s\n", __func__, dev_name(dev)); } /* this uses load-time allocation and initialization (instead of * doing it at run-time) to save code, eliminate fault paths, and * be more obviously correct. */ static struct pxa25x_udc memory = { .gadget = { .ops = &pxa25x_udc_ops, .ep0 = &memory.ep[0].ep, .name = driver_name, .dev = { .init_name = "gadget", .release = nop_release, }, }, /* control endpoint */ .ep[0] = { .ep = { .name = ep0name, .ops = &pxa25x_ep_ops, .maxpacket = EP0_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL), }, .dev = &memory, .regoff_udccs = UDCCS0, .regoff_uddr = UDDR0, }, /* first group of endpoints */ .ep[1] = { .ep = { .name = "ep1in-bulk", .ops = &pxa25x_ep_ops, .maxpacket = BULK_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN), }, .dev = &memory, .fifo_size = BULK_FIFO_SIZE, .bEndpointAddress = USB_DIR_IN | 1, .bmAttributes = USB_ENDPOINT_XFER_BULK, .regoff_udccs = UDCCS1, .regoff_uddr = UDDR1, }, .ep[2] = { .ep = { .name = "ep2out-bulk", .ops = &pxa25x_ep_ops, .maxpacket = BULK_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT), }, .dev = &memory, .fifo_size = BULK_FIFO_SIZE, .bEndpointAddress = 2, .bmAttributes = USB_ENDPOINT_XFER_BULK, .regoff_udccs = UDCCS2, .regoff_ubcr = UBCR2, .regoff_uddr = UDDR2, }, #ifndef CONFIG_USB_PXA25X_SMALL .ep[3] = { .ep = { .name = "ep3in-iso", .ops = &pxa25x_ep_ops, .maxpacket = ISO_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN), }, .dev = &memory, .fifo_size = ISO_FIFO_SIZE, .bEndpointAddress = USB_DIR_IN | 3, .bmAttributes = USB_ENDPOINT_XFER_ISOC, .regoff_udccs = UDCCS3, .regoff_uddr = UDDR3, }, .ep[4] = { .ep = { .name = "ep4out-iso", .ops = &pxa25x_ep_ops, .maxpacket = ISO_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT), }, .dev = &memory, .fifo_size = ISO_FIFO_SIZE, .bEndpointAddress = 4, .bmAttributes = USB_ENDPOINT_XFER_ISOC, .regoff_udccs = UDCCS4, .regoff_ubcr = UBCR4, .regoff_uddr = UDDR4, }, .ep[5] = { .ep = { .name = "ep5in-int", .ops = &pxa25x_ep_ops, .maxpacket = INT_FIFO_SIZE, .caps = USB_EP_CAPS(0, 0), }, .dev = &memory, .fifo_size = INT_FIFO_SIZE, .bEndpointAddress = USB_DIR_IN | 5, .bmAttributes = USB_ENDPOINT_XFER_INT, .regoff_udccs = UDCCS5, .regoff_uddr = UDDR5, }, /* second group of endpoints */ .ep[6] = { .ep = { .name = "ep6in-bulk", .ops = &pxa25x_ep_ops, .maxpacket = BULK_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN), }, .dev = &memory, .fifo_size = BULK_FIFO_SIZE, .bEndpointAddress = USB_DIR_IN | 6, .bmAttributes = USB_ENDPOINT_XFER_BULK, .regoff_udccs = UDCCS6, .regoff_uddr = UDDR6, }, .ep[7] = { .ep = { .name = "ep7out-bulk", .ops = &pxa25x_ep_ops, .maxpacket = BULK_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT), }, .dev = &memory, .fifo_size = BULK_FIFO_SIZE, .bEndpointAddress = 7, .bmAttributes = USB_ENDPOINT_XFER_BULK, .regoff_udccs = UDCCS7, .regoff_ubcr = UBCR7, .regoff_uddr = UDDR7, }, .ep[8] = { .ep = { .name = "ep8in-iso", .ops = &pxa25x_ep_ops, .maxpacket = ISO_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN), }, .dev = &memory, .fifo_size = ISO_FIFO_SIZE, .bEndpointAddress = USB_DIR_IN | 8, .bmAttributes = USB_ENDPOINT_XFER_ISOC, .regoff_udccs = UDCCS8, .regoff_uddr = UDDR8, }, .ep[9] = { .ep = { .name = "ep9out-iso", .ops = &pxa25x_ep_ops, .maxpacket = ISO_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT), }, .dev = &memory, .fifo_size = ISO_FIFO_SIZE, .bEndpointAddress = 9, .bmAttributes = USB_ENDPOINT_XFER_ISOC, .regoff_udccs = UDCCS9, .regoff_ubcr = UBCR9, .regoff_uddr = UDDR9, }, .ep[10] = { .ep = { .name = "ep10in-int", .ops = &pxa25x_ep_ops, .maxpacket = INT_FIFO_SIZE, .caps = USB_EP_CAPS(0, 0), }, .dev = &memory, .fifo_size = INT_FIFO_SIZE, .bEndpointAddress = USB_DIR_IN | 10, .bmAttributes = USB_ENDPOINT_XFER_INT, .regoff_udccs = UDCCS10, .regoff_uddr = UDDR10, }, /* third group of endpoints */ .ep[11] = { .ep = { .name = "ep11in-bulk", .ops = &pxa25x_ep_ops, .maxpacket = BULK_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN), }, .dev = &memory, .fifo_size = BULK_FIFO_SIZE, .bEndpointAddress = USB_DIR_IN | 11, .bmAttributes = USB_ENDPOINT_XFER_BULK, .regoff_udccs = UDCCS11, .regoff_uddr = UDDR11, }, .ep[12] = { .ep = { .name = "ep12out-bulk", .ops = &pxa25x_ep_ops, .maxpacket = BULK_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT), }, .dev = &memory, .fifo_size = BULK_FIFO_SIZE, .bEndpointAddress = 12, .bmAttributes = USB_ENDPOINT_XFER_BULK, .regoff_udccs = UDCCS12, .regoff_ubcr = UBCR12, .regoff_uddr = UDDR12, }, .ep[13] = { .ep = { .name = "ep13in-iso", .ops = &pxa25x_ep_ops, .maxpacket = ISO_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN), }, .dev = &memory, .fifo_size = ISO_FIFO_SIZE, .bEndpointAddress = USB_DIR_IN | 13, .bmAttributes = USB_ENDPOINT_XFER_ISOC, .regoff_udccs = UDCCS13, .regoff_uddr = UDDR13, }, .ep[14] = { .ep = { .name = "ep14out-iso", .ops = &pxa25x_ep_ops, .maxpacket = ISO_FIFO_SIZE, .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT), }, .dev = &memory, .fifo_size = ISO_FIFO_SIZE, .bEndpointAddress = 14, .bmAttributes = USB_ENDPOINT_XFER_ISOC, .regoff_udccs = UDCCS14, .regoff_ubcr = UBCR14, .regoff_uddr = UDDR14, }, .ep[15] = { .ep = { .name = "ep15in-int", .ops = &pxa25x_ep_ops, .maxpacket = INT_FIFO_SIZE, .caps = USB_EP_CAPS(0, 0), }, .dev = &memory, .fifo_size = INT_FIFO_SIZE, .bEndpointAddress = USB_DIR_IN | 15, .bmAttributes = USB_ENDPOINT_XFER_INT, .regoff_udccs = UDCCS15, .regoff_uddr = UDDR15, }, #endif /* !CONFIG_USB_PXA25X_SMALL */ }; #define CP15R0_VENDOR_MASK 0xffffe000 #if defined(CONFIG_ARCH_PXA) #define CP15R0_XSCALE_VALUE 0x69052000 /* intel/arm/xscale */ #elif defined(CONFIG_ARCH_IXP4XX) #define CP15R0_XSCALE_VALUE 0x69054000 /* intel/arm/ixp4xx */ #endif #define CP15R0_PROD_MASK 0x000003f0 #define PXA25x 0x00000100 /* and PXA26x */ #define PXA210 0x00000120 #define CP15R0_REV_MASK 0x0000000f #define CP15R0_PRODREV_MASK (CP15R0_PROD_MASK | CP15R0_REV_MASK) #define PXA255_A0 0x00000106 /* or PXA260_B1 */ #define PXA250_C0 0x00000105 /* or PXA26x_B0 */ #define PXA250_B2 0x00000104 #define PXA250_B1 0x00000103 /* or PXA260_A0 */ #define PXA250_B0 0x00000102 #define PXA250_A1 0x00000101 #define PXA250_A0 0x00000100 #define PXA210_C0 0x00000125 #define PXA210_B2 0x00000124 #define PXA210_B1 0x00000123 #define PXA210_B0 0x00000122 #define IXP425_A0 0x000001c1 #define IXP425_B0 0x000001f1 #define IXP465_AD 0x00000200 /* * probe - binds to the platform device */ static int pxa25x_udc_probe(struct platform_device *pdev) { struct pxa25x_udc *dev = &memory; int retval, irq; u32 chiprev; pr_info("%s: version %s\n", driver_name, DRIVER_VERSION); /* insist on Intel/ARM/XScale */ asm("mrc%? p15, 0, %0, c0, c0" : "=r" (chiprev)); if ((chiprev & CP15R0_VENDOR_MASK) != CP15R0_XSCALE_VALUE) { pr_err("%s: not XScale!\n", driver_name); return -ENODEV; } /* trigger chiprev-specific logic */ switch (chiprev & CP15R0_PRODREV_MASK) { #if defined(CONFIG_ARCH_PXA) case PXA255_A0: dev->has_cfr = 1; break; case PXA250_A0: case PXA250_A1: /* A0/A1 "not released"; ep 13, 15 unusable */ fallthrough; case PXA250_B2: case PXA210_B2: case PXA250_B1: case PXA210_B1: case PXA250_B0: case PXA210_B0: /* OUT-DMA is broken ... */ fallthrough; case PXA250_C0: case PXA210_C0: break; #elif defined(CONFIG_ARCH_IXP4XX) case IXP425_A0: case IXP425_B0: case IXP465_AD: dev->has_cfr = 1; break; #endif default: pr_err("%s: unrecognized processor: %08x\n", driver_name, chiprev); /* iop3xx, ixp4xx, ... */ return -ENODEV; } irq = platform_get_irq(pdev, 0); if (irq < 0) return -ENODEV; dev->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(dev->regs)) return PTR_ERR(dev->regs); dev->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(dev->clk)) return PTR_ERR(dev->clk); pr_debug("%s: IRQ %d%s%s\n", driver_name, irq, dev->has_cfr ? "" : " (!cfr)", SIZE_STR "(pio)" ); /* other non-static parts of init */ dev->dev = &pdev->dev; dev->mach = dev_get_platdata(&pdev->dev); dev->transceiver = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); if (gpio_is_valid(dev->mach->gpio_pullup)) { retval = devm_gpio_request(&pdev->dev, dev->mach->gpio_pullup, "pca25x_udc GPIO PULLUP"); if (retval) { dev_dbg(&pdev->dev, "can't get pullup gpio %d, err: %d\n", dev->mach->gpio_pullup, retval); goto err; } gpio_direction_output(dev->mach->gpio_pullup, 0); } timer_setup(&dev->timer, udc_watchdog, 0); the_controller = dev; platform_set_drvdata(pdev, dev); udc_disable(dev); udc_reinit(dev); dev->vbus = 0; /* irq setup after old hardware state is cleaned up */ retval = devm_request_irq(&pdev->dev, irq, pxa25x_udc_irq, 0, driver_name, dev); if (retval != 0) { pr_err("%s: can't get irq %d, err %d\n", driver_name, irq, retval); goto err; } dev->got_irq = 1; #ifdef CONFIG_ARCH_LUBBOCK if (machine_is_lubbock()) { retval = devm_request_irq(&pdev->dev, LUBBOCK_USB_DISC_IRQ, lubbock_vbus_irq, 0, driver_name, dev); if (retval != 0) { pr_err("%s: can't get irq %i, err %d\n", driver_name, LUBBOCK_USB_DISC_IRQ, retval); goto err; } retval = devm_request_irq(&pdev->dev, LUBBOCK_USB_IRQ, lubbock_vbus_irq, 0, driver_name, dev); if (retval != 0) { pr_err("%s: can't get irq %i, err %d\n", driver_name, LUBBOCK_USB_IRQ, retval); goto err; } } else #endif create_debug_files(dev); retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget); if (!retval) return retval; remove_debug_files(dev); err: if (!IS_ERR_OR_NULL(dev->transceiver)) dev->transceiver = NULL; return retval; } static void pxa25x_udc_shutdown(struct platform_device *_dev) { pullup_off(); } static int pxa25x_udc_remove(struct platform_device *pdev) { struct pxa25x_udc *dev = platform_get_drvdata(pdev); if (dev->driver) return -EBUSY; usb_del_gadget_udc(&dev->gadget); dev->pullup = 0; pullup(dev); remove_debug_files(dev); if (!IS_ERR_OR_NULL(dev->transceiver)) dev->transceiver = NULL; the_controller = NULL; return 0; } /*-------------------------------------------------------------------------*/ #ifdef CONFIG_PM /* USB suspend (controlled by the host) and system suspend (controlled * by the PXA) don't necessarily work well together. If USB is active, * the 48 MHz clock is required; so the system can't enter 33 MHz idle * mode, or any deeper PM saving state. * * For now, we punt and forcibly disconnect from the USB host when PXA * enters any suspend state. While we're disconnected, we always disable * the 48MHz USB clock ... allowing PXA sleep and/or 33 MHz idle states. * Boards without software pullup control shouldn't use those states. * VBUS IRQs should probably be ignored so that the PXA device just acts * "dead" to USB hosts until system resume. */ static int pxa25x_udc_suspend(struct platform_device *dev, pm_message_t state) { struct pxa25x_udc *udc = platform_get_drvdata(dev); unsigned long flags; if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command) WARNING("USB host won't detect disconnect!\n"); udc->suspended = 1; local_irq_save(flags); pullup(udc); local_irq_restore(flags); return 0; } static int pxa25x_udc_resume(struct platform_device *dev) { struct pxa25x_udc *udc = platform_get_drvdata(dev); unsigned long flags; udc->suspended = 0; local_irq_save(flags); pullup(udc); local_irq_restore(flags); return 0; } #else #define pxa25x_udc_suspend NULL #define pxa25x_udc_resume NULL #endif /*-------------------------------------------------------------------------*/ static struct platform_driver udc_driver = { .shutdown = pxa25x_udc_shutdown, .probe = pxa25x_udc_probe, .remove = pxa25x_udc_remove, .suspend = pxa25x_udc_suspend, .resume = pxa25x_udc_resume, .driver = { .name = "pxa25x-udc", }, }; module_platform_driver(udc_driver); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:pxa25x-udc");